Electric lamp for motor-vehicles.



E. B. OORGORAN.

ELECTRIC LAMP FOR MOTOR VEHIGLE3.

APPLICATION FILED FEB. 6, 1914-.

Patented Jan. 19, 1915.

EDWARD IB. conconnn, or CINCINNATI, OHIO.

ELECTRIC LAMI non 'noron-vnnrctns.

Specification of Letters 'Patent.

Patented J an. 19, 1915.

Application filed February 6, 19 14. Serial No. 816,890.

lball whom it may concern Be it-known that I, EDWARD B. CORCORAN, acitizen of the United States, and a resident of the city of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Electric ,Lam-ps for Motor- Vehicles, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

In the use of electric incandescent bulbs Y in combination with parabolic reflectors, the

proper focus of the, shaft of light thrown by the lamp so made, is accomplished by shifting the position of the bulb in and out from the center of the reflector.

The obvious method and one extensively heretofore'adopted has been means of an adjusting screw acting directly on the-bulb support in a line with the axis of the bulb. This construction necessitates the attachment of the Wires from the side, as the adjusting screw interferes with a direct attachment from the end, and in addition to this inasmuch as the stem of the bulb is necessarily of considerable length and it must be provided with a bearingof corresponding length, unless the parts are accurately fitted the adjusting screw is very apt to get out of alinement, making it diflicult to operate.

It is to obviate these objections that my invention is directed, and it consists of that certain novel construction and arrangement of parts to be hereinafter pointed out and claimed whereby an adjustment of the bulb is provided from the side, or out of line with the axis of the bulb, and the wire attachment is made in direct alinement with this axis.

In the drawings, Figure l is a horizontal section through a lamp constructed according to my invention. Fig. 2 is .an enlarged view of the central portion of Fig. 1. Fig. 3 is an end elevation of the socket piece.

1 is the back casing, and 2 the parabolic reflector of an electric lamp. An aperture is provided in the exact center of the reflector and in the back casing with the flanges 3 and 4 around said apertures respectively, turned inwardly toward the space between the two parts. In the passageway so formed, supported by the flanges, is placed the socket piece 5, having suitably secured to it a collar 6. This socket piece has an outer portion insulated by the core 7 from the conductor spring pins 8 inside of the core. The inner construction of this piece is simple and well known in the art. The pins 8 are held apart in tubes 13 of conductive material by springs (not shown) within the tubes, so that when the bulb 9 and the circuit con-nection piece 10 are in place, they will be pressed by the springs. The metallic ends of the bulb 9 and of the piece 10 have insulated outer and inner con ductors, as has the socket piece. Pinsll, 11, in each instance are mounted on these ends and adapted to be forced into the L- slots 12, 12, of each end of the socket piece. The spring pins then hold the parts in place, as is obvious. -A screw 14, with ahead 15, is inserted through the back casing and screwed-into an aperture 16 in the lug 17 on the collar 6. A spring 18 is mounted over this screw and bears against the back casing and the lug 17. When the screw is turned, the force of the spring will hold the screw from unscrewing from the collar piece, and the collar will travel on the screw and the lamp. will be advanced or retracted as the case may be.

It can now be seen that a durable, simple and inexpensive means is provided for forcing the bulb of the electric light in and out to obtain the proper focal position, and that the wire connections for the lamp can be readily made in direct alinement with the axis of the bulb.

The advantages of having the circuit connection direct onto the socket piece for holding the bulb and then moving this socket art where the socket piece for the bulb'is retracted directly, the wires inserted into the piece, is quite obvious over structures in the means and then broughtaround to connect with the bulb socket.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a device of the character described, a reflector shell, and a back casing, a socket piece, one end having a socket for the bulb and the otherend having a socket for the circuit connection, flanges at the central point of the shell and the casing for slidably moimting the socket piece, one end of said socket piece lying outside the back casing and one inside the reflector shell, and means for adjustably retaining the socket piece therein.

' 2. lln a device of the character described,

a reflector shell, and a back casing, a socket.

piece, one end having a socket for the bulb and the other end having a socket for the circuit connection, flanges at the central point of the shell and the casing for slidably mounting the socket piece, one end of said socket piece lying outside of the back casing and one inside the reflector shell, and means located between the shell and casing foradj ustably retaining the socket piece.

3. In a device of the character described, a reflector shell, and a back casing, a socket piece, one end having a socket for the bulb and the other end having a socket for the circuit connection, flanges at the central point of the shell and the casing for slidably mounting the socket piece, one end of said socket piece lying outside of the back casing and inside the reflector shell, a collar mounted on said socket piece, and means for adjustably retaining the collar between the shell and easing.

4. In a device of the character described, a reflector shell, and'a back casing, a socket piece, one end having a socket for the bulb menace and the other end having a socket for the circuit connection, flanges at the central point of the shell and the casing for slidably mounting the socket piece, one end of said socket piece lying outside of the back casing and inside the reflector shell, a collar mounted on said socket piece, a lug on the collar, and a screw in the back casing and engaging said lug to adjust the position of the collar. 5. In a device of the character described, a reflector shell, and a back casing, a socket piece one end having sockets for the bulb and the other having sockets for the circuit connection, flanges at the central point of the shell and casing for slidably mounting the socket piece, one end of the socket piece lying outside of the back casing and one end inside the reflector shell, a collar mounted on said socket piece, a lug on the collar, and a screw in the back casing and engaging the lug, and a spring between the lug and the back casing, for the purpose described.

' EDWARD B. CORCORAN.

Attest:

EDWARD W. DUEMEYER,

W. E. STACEY. 

